Wrong username and displayname after user registraton WooCommerce - wordpress

Question

When people are buying a product through the WooCommerce extension, I have enabled that they can create an account on checkout. I don't let them choose their own username and password.
Now I see that WP uses some part of the emailaddress to create a username, and the display name is based on the first name filled in on checkout.
Now I want to change that:
username must be the complete emailaddress [SOLVED];
display name must be the first name + last name [UNSOLVED].
I tried this: for display name with my 'no knowledge' of PHP:
add_filter('pre_user_display_name', 'wsis_pre_user_display_name');
function wsis_pre_user_display_name($display_name) {
$first = get_user_field("billing_first_name");
$last = get_user_field("billing_last_name");
$display_name = $first . $last;
return $display_name;
}
This filter is mentioned in their codex: http://codex.wordpress.org/Function_Reference/wp_update_user. But no examples and my code didn't work. Anybody can help?
In user.php wp-includes folder I found the filter, now get it working :-).
/**
* Filter a user's display name before the user is created or updated.
*
* #since 2.0.3
*
* #param string $display_name The user's display name.
*/
$display_name = apply_filters( 'pre_user_display_name', $display_name );
if ( empty($description) )
$description = '';
Second try did something! It left the display name completely empty:
add_filter('pre_user_display_name', 'pre_user_display_name');
function pre_user_display_name($display_name) {
$first = get_the_author_meta('first_name');
$last = get_the_author_meta('last_name');
$display_name = $first . $last;
return $display_name;
}
Am I on the right track?

Answer 1

To set the username as complete email address, you can add following code in functions.php file of your theme.
add_filter('woocommerce_new_customer_data','change_username');
function change_username($user_data)
{
return array(
'user_login' => $user_data['user_email'],
'user_pass' => $user_data['user_pass'],
'user_email' => $user_data['user_email'],
'role' => 'customer'
);
}

Answer 2

Here is how to set the display name to first name + last name.
// Sets the display name to first name and last name
add_filter( 'pre_user_display_name' , 'default_display_name' );
function default_display_name($name) {
if ( isset( $_POST['billing_first_name'] ) ) {
$firstname = sanitize_text_field( $_POST['billing_first_name'] );
}
if ( isset( $_POST['billing_last_name'] ) ) {
$lastname = sanitize_text_field( $_POST['billing_last_name'] );
}
$name = $firstname . ' ' . $lastname;
return $name;
}
Source : http://geektamin.com/blog/533/why-update_user_meta-display_name-doesnt-work-and-how-to-use-pre_user_display_name-instead/